To answer the OP's question, bass incl: low, mid & upper bass is very important to providing the fundamentals of the music. You want bass that is tight, can reproduce the lowest registers for instruments such as a timpani and church organ, moves plenty of air & offers good inner detail and texture.
Having good bass fundamentals not only lays down the foundation for the music, but is very important to the overall coherency of a speaker. Slow, flabby bass can smear the midrange, negatively impacting the sound of a loudspeaker.
Having good bass fundamentals not only lays down the foundation for the music, but is very important to the overall coherency of a speaker. Slow, flabby bass can smear the midrange, negatively impacting the sound of a loudspeaker.